Need Advice

So I'm 19 years old and have been with my boyfriend for a year. We have sex regularly and have since the beginning of our relationship, but he has never made me cum but I have told him that he has many times. I feel really guilty for lying but I don't want to tell him that he doesn't make me orgasm. The sex is good and he makes me really horny but I just can't orgasm. Do I tell him or just leave it be?